cat /proc/<PID>/cmdline
root@COMP1:/home/user1# ps axww | grep rdp
2935 ? Sl 142:00 /usr/sbin/xrdp
2940 ? SL 0:00 /usr/sbin/xrdp-sesman
3587 ? S 0:00 /usr/sbin/xrdp-sessvc 3590 3589
3596 ? Sl 0:00 xrdp-chansrv
24035 pts/3 S+ 0:00 grep rdp
root@COMP1:/home/user1# cat /proc/2935/cmdline
/usr/sbin/xrd
proot@COMP1:/home/user1# cat /proc/2940/cmdline
/usr/sbin/xrdp-sesman
root@COMP1:/home/user1# cat /proc/3587/cmdline
/usr/sbin/xrdp-sessvc35903589
root@COMP1:/home/user1# cat /proc/3596/cmdline
xrdp-chansrv
root@COMP1:/home/user1# cat /proc/24035/cmdline
cat: /proc/24035/cmdline:
??
??
root@COMP1:/home/user1#